How to forward Internet access to vds from VLAN through two routers?

Question

linux

Tell me which way to dig: there is a virtual machine in the vlan with the address 10.x.x.x. Through the 10.x.x.1 gateway, it has access to the network to the 172.16.x.x network. In the network 172.16.x.x there is a gateway 172.16.x.100 through which there is access to the Internet.
How to forward access to the Internet for a virtual machine in vlan. router with address 10.х.х.1 is unavailable for configuration

Answer 1

on the gateway 172.16.x.100 add a route to the network 10.x.x.x
on the gateway 172.16.x.100 natit packets from 10.x.x.x
PS Criticism is welcome ...

Answer 2

vpn tunnel from virtual machine to gateway 172.16.x.100

Answer 3

why white ip - the task is to provide access to the Internet from the inside
, two internal networks are united by routing through gateways on both sides on the router - to which there is just no access.
in general, the solution seems to be one - vpn.
since encryption is not needed, I would like to try through the gre tunnel.